Phonograph driving mechanism



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PHONOGRAPH DRIVING MECHANISM Filed Dec. 31, 1930 3 Sheets-Sheet 5 Zlwinntoz Patented Apr. 25, 1933 I UNITED STATES PATENT OFFICE WILBUR J. PEETS, OF ELIZABETH, NEW JERSEY, ASSIGNOR '1'0 DIEHL MANUFACTUR- ING- COMPANY, OF ELIZABETH, NEW JERSEY, A CORIPORATION OF NEW JERSEY PHONOGRAPH DRIVING MECHANISM Application filed December 31, 1930. Serial No. 505,712.

This invention relates to phonographs and has for an object to provide a phonograph turntable mechanism which may conveniently be used for driving records of different standard rated speeds, such as the usual 10 or 12 inch domestic type of record the rated speed of which is 78 R. P. M., and the 16 inch professional or broadcasting type of record the rated speed of which is 33 R. P. M.

The invention comprises the devices, combinations and arrangements of parts hereinafter described and claimed.

The features of the invention and the advantages attained thereby Will be readily understood by those skilled in the art from the following detailed description of a preferred embodiment of the invention illustrated in the accompanying drawings in which Fig. 1 is a side elevation of a phonograph turntable mechanism embodying the invention. Fig. 2 is a top plan view of the mechanism. Fig. 3 is a section on the line 3-3, Fig. 2, on an enlarged scale, and Figs. 4, 5 and 6-are perspective views of elements of the mechanism.

The invention is illustrated as embodied in a phonograph turntable mechanism which, except as hereinafter described, is constructed substantially in accordance with the disclosure of the patents to H. L. Zabriskie, No. 1,838,047, of Dec. 22, 1931, and Wilbur J. Peets, No. 1,838,060, of Dec. 22, 1931.

Such a mechanism is constructed with a frame 1 having at one end the seats 2 for the'motor 3 the shaft 4 of which is j'ournaled b in the frame-bearings 5, 6 and carries the usual manually adjustable speed-governor 7 which holds the speed of the motor-shaft 4 substantially constant.

The frame 1 is formed with a lubricant well 8 the top of which is closed by a removable bearing-plug 9 in which is journaled the sleeve-shaft 10 formed at its upper end with a gear 11 and permanently carrying a coupling pin 12 which projects upwardly beyond the upper end of the sleeve-shaft 10, as shown in Fig. 5.

Journaled in the sleeve-shaft 10 and in the ball-step-bearin 13 at the bottom of the well 8 is he turnta le-shaft 14 carrying the turntable 15 which is preferably constructed substantially in accordance with the disclosure of the patent to F. Diehl, No. 1,823,533, of Sept. 15, 1931, but may be of any usual or suitable construction.

There is secured to the turntable-shaft 14, within the well 8, a collar 16 which supports the sleeve-shaft 10. A collar 17 is secured to the sleeve-shaft 10 to prevent upward displacement of the latter. There is also secured to the sleeve-shaft 10, within the well 8, a collar 18 havin the downwardly extending pins 19 which reely enter the apertures 20 in the gear 21 supported by the collar 16 and shaft 10 and meshin with the worm 22 formed on the motor-sha t 4 within the lubricant cavity or well 8. The motor-shaft 4 is thus geared to drive the sleeve-shaft 10, which latter is connected at its upper end to the turntable-shaft 14 by a selective twospeed transmission gear mechanism above the plug 9, as will now be described.

Screwed into the top of the bearing-plug 9 is a bearing pin 23 for the reduction gear 24 to which is fixed the larger gear 25 meshing at all times with the gear 11 on the sleeve-shaft 10. Slidably keyed to the turntable-shaft 14 is the shiftable gear 26 the hub 27 of which is formed at its lower end with four radial grooves 28, Fig. 4, any one of which may be entered by the coupling pin 12 in the lower working position of the gear 26 'on the shaft 14. The gear-hub 27 is formed with the internal key-way 29 entered y the key-pin 30 fixed to the turntableshaft 14. The shaft 14 is formed with upper and lower grooves 31, 32 either of which may be entered by the ball 33 mounted in the radial bore 34 in the gear-hub 27 and backed by the spring 35 which is retained in the bore 34 by, the split ring 36 resiliently gri ping the groove 37 in the hub 27. When t 0 gear 26 is shifted upwardly to carry the ball 33 from the groove 32 to the groove 31, it is uncoupled from direct driven relation with the sleeve-shaft 10, and the gear 26 is caused to mesh with the reduction gear 24. The ratio of gearing is substantially as 78 is to 33 so that if the speed-regulator 7 is adjusted to hold a turntable speed of 78 R. M. P. with the gear 26 in its lower position, the turn- 7 table speed may be instantly changed to 33 4 R. P. M. by shifting the gear 26 to its upper working position, without necessitating readjustment of the speed-regulator 7. This provision enables the device to be easily and quickly adapted for records of either of the two standard rated speeds known to the trade.

To enable the gear 26 to be readily shifted, its hub 27 is formed with a peripheral groove 38 entered by the crank-pin 39 fixed to the crank-arm 40 pinned to the rock-shaft 41 journaled in the bearing-block 42 fixed to the frame 1 by screws 43. The shaft 41 extends beyond the rim of the turntable 15 and has fixed to its free end an arm 44 which extends upwardly through a slot 45 in the usual topboard 46 and terminates in the finger-piece 47 by which the selective two-speed transmission gear mechanism may be manually controlled. I

It is understood that the entire driving l mechanism may be spring-suspended in the usual manner from the plate 48 which is set into an aperture in the top-board 46.

Having thus set forth the nature of the invention, what I claim herein is 1. A phonograph driving device having a frame formed with a lubricant well, a removable bearing-plug closing the top of said well, a horizontal motorshaft, a vertical sleeve-shaft journaled in said bearing-plug and extending into said well, a worm on the motor-shaft, a gear on said sleeve-shaft meshing with said worm in said well, a turntable- V shaft journaled in said sleeve-shaft, and a selective two-speed gear transmission mechanism above said bearing-plug and between said sleeve and turntable-shafts, said mechanism including a driving gear on said sleeveshaft, a sliding gear splined to the'turntable-shaft, and a pair of rigidly connected intermediate gears journaled on said removable bearing plug.

2. A two speed drive for phonograph turntables comprising a frame, a sleeve-shaft hollow from end to end and journaled between its ends in said frame, a turntable-shaft passing entirely through said sleeve-shaft and having a step-bearing engagement at its lower end with said frame, said turntable, shaft being steadied above said step bearing by 1ts bearing engagement with the upper end of saidsleeve-shaft and being otherwise 1 independent of said frame, a motor connected to drive said sleeve-shaft, and a manually controlled selective two-speed transmission connection between said sleeve-shaft and said turntable-shaft.

- In testimony whereof I have signed my name to this specification.

WILBUR J. PEETS. 

